Shell and power battery
A power battery and housing technology, applied in the field of housings and power batteries, can solve the problems of reducing the life of the housing, cracking the housing, and low service life of the power battery, so as to suppress the generation of internal stress in the housing and prevent the cracking of the housing , the effect of preventing gas accumulation
Active Publication Date: 2020-07-28
CONTEMPORARY AMPEREX TECH CO
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0002] The current power battery will generate a lot of gas during use. At present, the power battery is mostly made of aluminum or aluminum alloy casing. Because the casing is airtight, the gas cannot be discharged outside the casing and accumulates inside the battery, so that the internal pressure continues to increase. , causing the casing to rupture or cause stress creep in the casing, reducing the life of the casing, resulting in a lower service life of the power battery
[0003] At present, people try to install a one-way valve on the power battery to discharge the gas out of the shell through one-way exhaust, but it is still necessary to accumulate a certain air pressure inside the power battery to open the one-way valve, so it will still accumulate in the power battery. A certain air pressure cannot solve the above problems
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0079] Preparation of positive electrode sheet
[0080] The cathode active material LiNi 0.8 co 0.1 mn 0.1 o 2 , conductive carbon black and binder polyvinylidene fluoride (PVDF) are dispersed in the solvent N-methylpyrrolidone (NMP), and stirred evenly to obtain the positive electrode slurry; the positive electrode slurry is evenly coated on the aluminum foil of the positive electrode current collector , after drying, cold pressing, slitting, and cutting into pieces, the positive electrode sheet is obtained. Among them, the positive electrode active material LiNi 0.8 co 0.1 mn 0.1 o 2 The weight ratio of conductive carbon black and binder PVDF is 96:2:2.
[0081] Preparation of negative electrode sheet
[0082] Negative electrode active material artificial graphite, conductive carbon black, thickener carboxymethyl cellulose (CMC) and binder styrene-butadiene rubber (SBR) are dispersed in solvent deionized water according to the weight ratio 96:1:1:2, stir Unifor...
Embodiment 2～12 and comparative example 1～2
[0092] The difference from Example 1 is that the related parameters of the side wall are adjusted, see Table 1 for details.
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Abstract
The invention discloses a shell and a power battery, and belongs to the technical field of energy storage. The shell comprises side walls, wherein an accommodating cavity for accommodating a battery cell of the power battery is defined by the side walls; the gas transmission amount A of the side wall and the thickness B of the side wall satisfy the condition that A / B is greater than or equal to 1.2 and less than or equal to3300, the unit of A is cm<3> / (m<2>.S.0.1MPa), and the unit of B is mm. According to the shell provided by the invention, the gas transmission amount A and the thickness B ofthe side wall satisfy an appropriate proportional relationship, gas generated in the use process of the power battery can be discharged out of the shell in time, gas accumulation inside the shell isprevented, low pressure is kept in the shell, shell breakage is effectively prevented, generation of internal stress of the shell is restrained, and external water vapor is effectively prevented frompenetrating through the shell and entering the shell, so that the shell has high air permeability, external water vapor isolation performance and long-term mechanical performance, and the power battery is enabled to have long service life.
Description
technical field [0001] The present application belongs to the technical field of energy storage devices, and in particular relates to a casing and a power battery. Background technique [0002] The current power battery will generate a lot of gas during use. At present, the power battery is mostly made of aluminum or aluminum alloy casing. Because the casing is airtight, the gas cannot be discharged outside the casing and accumulates inside the battery, so that the internal pressure continues to increase. , causing the casing to rupture or cause stress creep in the casing, reducing the life of the casing, resulting in a lower service life of the power battery. [0003] At present, people try to install a one-way valve on the power battery to discharge the gas out of the shell through one-way exhaust, but it is still necessary to accumulate a certain air pressure inside the power battery to open the one-way valve, so it will still accumulate in the power battery. A certain a...
Claims
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IPC IPC(8): H01M2/02H01M50/116H01M50/131
CPCH01M50/116H01M50/131Y02E60/10
Inventor 赵丰刚曾毓群王志秦峰马林肖信福王晓帆何润泳
Owner CONTEMPORARY AMPEREX TECH CO